Centering device for lathes



(No Model.)

- R. L. LEVIN.

(ENTERING DEVIGE FOR LATHES.

No. 517,466. Patented Apr. 3, 1894.

Wiiryzsszs UNIT D STATES PATENT QFFICE.

RUDOLPH LEANDER LEVIN, OF MENOMINEE, MICHIGAN,

CENTERING DEVICE FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 517,466, dated April 3,1894. Application filed January 16 1894- sens No, 497,070- (No model.)

1'0 all whom it may concern:

Be it known that I, RUDOLPH LEANDER LEVIN, a citizen of the UnitedStates, residing at Menominee, in the county of Menominee and State ofMichigan, have invented a new.

and. useful Centering Device for Lathes and Turners, of which thefollowing is a specificav1on.

My invention relates to a centering device The centering deviceembodyingmy inven-" tion is'showninLetters Patent No. 511,053, grantedto me on December 19, 1893, and is adapted especially for use inconnection with a turning machine such as that forming thesubject-matter of such patent.

Various objects and advantages of this invention will appear in thefollowing description, and the novelfeatures thereof willbe particularlypointed out in the appended claims.

In the drawings: Figure 1 is a perspective view of a centering deviceembodying my invention applied in the operative position to a baserepresenting that of a turning machine, said base being attached to thecrankarm carrying the wrist-pin to be turned. Fig. 2 is a section, takencentrally and parallel with the axis of the wrist-pin, and showing theparts in the positions indicated in Fig. 1.

Fig. 3 is a detail view of the clamp and scriber.

Fig. 4 is a similar view of the standard or gage.

Similar numerals of reference indicate corresponding parts in all thefigures of the drawlngs.

1 represents a crank-arm, having a crank or wrist pin 2, which it isdesired to turn; and 3 represents a base adapted to support a turningmachine, such as that indicated in the Letters Patent above mentioned,and providcd with securing devices 4:, of any desired or preferredconstruction. This base may be provided, as shown in the drawings, witha guide 5, adapted for the turning machine.

6 represents a standard or gage, provided with a recessed foot 7 to fitupon the guide 5, and having at its outer end a sleeve 8, the axis ofwhich is arranged at a distance from the plane of the base 1, whichcorresponds accurately with the distance between the axis of the spindleof the turning machine and the plane of the base, and therefore it isobvious that when the base is secured upon a crankarm at such a pointthat when the standard or gage is fitted thereupon its sleeve is alignedaccurately with the axis of the wrist-pin to be turned, that when theturning machine is applied to the said base it will be properly adjusted for operation.

It is well known that wrist-pins turn out of center as they wear, fromthe fact that, under ordinary circumstances, the wear is unevenlydistributed, and is concentrated, more or less, upon one side of thepin, and therefore, in order that the axis of the wrist-pin, after ithas been dressed or turned, may remain the same as before, it isnecessary to provide some means for ascertaining the accurate center,whereby the sleeve of the standard or gage may be aligned therewith. Themeans which I employ for ascertaining this correct axis or center of thewrist-pin'consist of an annular clamp 9, which is provided with theradiallydisposed gage-screws 10, projecting into the space inclosed bythe clamp andadapted to engage the surface of the wrist-pin, as shownclearly in Figs. 1 and 2. This clamp embodies a spider 11, whichsupports a spindle 12, said spindle being concentric with the peripheryof the clamp. After applying this clamp to the wrist-pin, and adjustingthe gage-screws to bear at their inner ends upon the surface of the pin,and thus hold the clamp in place, the eye 13 of an arm 14 is fitted uponthe spindle 12, said arm being longer than the radius of the clamp andbeing provided, at its outer end, with a terminal guide 15, having aset-screw 16. In this guide is adjustably fitted one arm of an angularscriber 17, provided with a point 18, which is adapted to traverse thesurface of the wrist-pin. It is evident that the scriber is angularlyadj ustable in the guide to bring its point close to the surface of thewrist-pin irrespective of the size of such pin; and by swinging the arm14 around the spindle of the clamp, and watching the point .of thescriber as it trav- Too erses the surface of the pin, the operator isenabled, by the proper adjustment of the gage screws to arrange theclamp so that its spindle will be in accurate alignment with the correctaxis of the wrist-pin. After this has been accomplished, the swingingarm may be released, and the base 1, upon which the standard or gage 6has been fitted, must be moved to enable the sleeve of said standard 10or gage to be fitted upon the projecting end of the spindle 12, whichcorresponds in diameter with the sleeve, as shown clearly in Fig. 2,after which, and while the base is held in such adjusted position by theengagement :5 of the sleeve 8 with the spindle 12, the securing devicesshould be adjusted or tightened to fasten the base. The centeringapparatus may now be detached from the wrist-pin and the base to allowthe operator to apply the turning machine.

The utility of the above-described device will be manifest to thoseskilled in the art to which it appertains, in that the accuratecentering of the turningmachine is essential to efficient work, is underordinary circumstances difiicult of attainment, and is, by means of theconstruction above described, attainable without loss of time, and withmathematical accuracy.

It will be understood that various changes in the form, proportiomandthe minor details of construction may be resorted to without departingfrom the principle or sacrificing any of the advantages of thisinvention.

Having described my invention, what I claim is- 1. In a device of theclass described, the combination with a base, and means for securing thesame in its adjusted positions, of a clamp adapted to be secured to awrist'pin and provided with aconcentric spindle, means for centering theclamp with the wrist-pin, and a standard or gage fitted upon the baseand provided with means to engage the spindle of the clamp, such meansbeing arranged at a predetermined interval from the plane of the base,substantially as specified.

2. In a device of the class described, the combination of a clampprovided with gage screws and having a concentric spindle, a standard orgage having a sleeve to engage said spindle, and a rotatable scribermounted concentric with the spindle, substantially as specified.

3. In a device of the class described, the combination of a clampprovided with gage screws to engage a wrist-pin, and having a concentricspindle, an arm swiveled upon said spindle, and a scriber carried by thearm, substantially as specified.

4. In a device of the class described, the combination of a clampprovided with adj ust ing devices, an arm swiveled concentric with saidclamp, and a scriber carried by said arm, substantially as specified.

5. In a device of the classdescribed, the combination of a clampprovided with gage screws and having a concentric spindle, an

arm swiveled upon said spindle and provided with a terminal guide, andan angular scriber having one arm fitted in said guide and the other armprovided with a terminal point, substantially as specified.

G. The herein described centering device for wrist-pins, the samecomprising a clamp provided with adjusting devices to engage the surfaceof a wrist-pin and having a concentric spindle, a scriber-carrying armfulcrumed upon said spindle, and a standard or gage adapted to be fittedupon the guide on the base of a turning machine and provided with asleeve to fit the extremity of the spindle of said clamp, substantiallyas specified.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

RUDOLPH LEANDER LEVIN.

Witnesses:

JAMES C. JOHNSON, FRANK BRACELIN.

